637397 has 4 divisors (see below), whose sum is σ = 640800. Its totient is φ = 633996.

The previous prime is 637379. The next prime is 637409. The reversal of 637397 is 793736.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 637397 - 2¹⁴ = 621013 is a prime.

It is a Duffinian number.

Its product of digits (23814) is a multiple of the sum of its prime divisors (3402).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (637327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1403 + ... + 1800.

It is an arithmetic number, because the mean of its divisors is an integer number (160200).

2⁶³⁷³⁹⁷ is an apocalyptic number.

It is an amenable number.

637397 is a deficient number, since it is larger than the sum of its proper divisors (3403).

637397 is a wasteful number, since it uses less digits than its factorization.

637397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3402.

The product of its digits is 23814, while the sum is 35.

The square root of 637397 is about 798.3714674260. The cubic root of 637397 is about 86.0603956504.

The spelling of 637397 in words is "six hundred thirty-seven thousand, three hundred ninety-seven".